# Add kernel cmdline tuning to the systemd-boot loader entries, idempotently.
# systemd-boot reads `options` at boot — no initramfs/entry regeneration needed.
# (intel_iommu is harmless on AMD CPUs; both target machines are Intel.)

toks="intel_iommu=on iommu=pt"                          # VFIO / PCI passthrough
[ "$GPU" = amd ] && toks="$toks amdgpu.mcbp=0 amdgpu.ppfeaturemask=0xfff7ffff"

shopt -s nullglob
entries=(/boot/loader/entries/arch*.conf)
[ "${#entries[@]}" -gt 0 ] || die "no loader entries in /boot/loader/entries (run base install first)"

for f in "${entries[@]}"; do
  opts="$(sed -n 's/^options //p' "$f")"
  for t in $toks; do
    case " $opts " in *" $t "*) ;; *) opts="$opts $t" ;; esac
  done
  sed -i "s|^options .*|options $opts|" "$f"
  info "$(basename "$f"): options $opts"
done